CN106824731A - Subject information acquisition device and its control method - Google Patents
Subject information acquisition device and its control method Download PDFInfo
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- CN106824731A CN106824731A CN201710112853.8A CN201710112853A CN106824731A CN 106824731 A CN106824731 A CN 106824731A CN 201710112853 A CN201710112853 A CN 201710112853A CN 106824731 A CN106824731 A CN 106824731A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0292—Electrostatic transducers, e.g. electret-type
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- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
- B06B1/0629—Square array
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52046—Techniques for image enhancement involving transmitter or receiver
- G01S7/52047—Techniques for image enhancement involving transmitter or receiver for elimination of side lobes or of grating lobes; for increasing resolving power
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
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- G10K11/18—Methods or devices for transmitting, conducting or directing sound
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- G10K11/34—Sound-focusing or directing, e.g. scanning using electrical steering of transducer arrays, e.g. beam steering
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- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
- G01S15/8977—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques using special techniques for image reconstruction, e.g. FFT, geometrical transformations, spatial deconvolution, time deconvolution
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Abstract
A kind of subject information acquisition device and its control method.The subject information acquisition device for being used includes：Detector, including multiple conversion elements, acoustic wave is sent to subject by it, and is that time series receives signal by reflected wave conversion；And processor, frequency domain interferometric method is performed by application Adaptive Signal Processing using the multiple reception signals and reference signal that are exported from the multiple conversion element, and obtain the acoustic properties of multiple positions.The detector is configured such that：When the direction for arranging the multiple conversion element is first direction and second direction, the end in second direction has the transmission acoustic pressure of the acoustic wave lower than center section in a second direction.
Description
The application is that, based on Application No. 201410169720.0, the applying date is on April 25th, 2014, entitled
The divisional application of the Chinese patent application of " subject information acquisition device and its control method ".
Technical field
The present invention relates to a kind of subject information acquisition device and its control method.Especially, the present invention relates to be used to lead to
Cross to be sent to subject and receive the back wave of subject internal reflection acoustic wave and obtain the technology of subject information.
Background technology
In as the supersonic diagnostic appts of subject information acquisition device, when the wavelength of ultrasonic wave is λ and send wave
When number is n, the spatial resolution on depth direction can be usual in the case where view data is formed via pulse echo technique
It is expressed as (n λ)/2.For example, when the ultrasonic wave of two centre frequencies with 12MHz of wavelength of transmission, on depth direction
Spatial resolution will be approximately 0.13mm.
Now explain pulse echo technique.First, when ultrasonic pulse (acoustics wave impulse) is sent to subject, ultrasonic root
Reflected and returned according to the acoustic impedance difference in subject.Next, back wave is received, and the reception of back wave is believed
Number for generating view data.Generally, the envelope for receiving signal is obtained, and acquired envelope is converted into brightness value, with
Generation view data.As the result for repeating to send the multiple directions in subject or position and receive ultrasonic wave, can be with
Obtain the monochrome information on the multiple scan lines on the direction for sending and receiving ultrasonic wave.Can be by arranging on many
The monochrome information of individual scan line is imaged to subject inside.
Note, in supersonic diagnostic appts, multiple conversion elements are used to for ultrasonic wave to be converted to electric signal, and by inciting somebody to action
Time shift is added to the reception signal waveform between each element, sends and receives and is generally all focused in subject.
As described above, although the sky on the depth direction of approximate 0.13mm can be realized by using pulse echo technique
Between resolution ratio, but need spatial resolution higher.If for example, further can in detail observe the layer of the vascular wall of arteria carotis
Structure, then this can aid in the early detection of artery sclerosis etc..
Non-patent literature 1 is shown by performing frequency domain interferometric method (FDI methods) and as the Capon of Adaptive Signal Processing
The result that method is imaged come the Rotating fields to vascular wall.Held as by using reception signal and using FDI methods
The result of row Capon methods, can further improve the spatial resolution on depth direction (scan-line direction).However, this is false
Shearing is located at for there are multiple reflecting layer in the range of signal (process range) in the depth direction for performing FDI treatment.
In addition, it is more likely that the multiple back waves near reflection layer will mutually have high correlation.When Adaptive Signal Processing (such as
Capon methods) directly apply to as described above with high correlation multiple back waves reception signal when, it is known that it is undesirable
Operation (such as disappearance of echo signal) is prone to.In order to reduce from the signal (correlation interference ripple) with foregoing correlation
Influence, can by additionally frequency of use equalize technology FDI methods and Capon methods are applied to connecing for back wave
The collection of letters number.
Additionally, using frequency averaging for the reception signal with wide band acoustic wave (such as impulse wave)
During technology, the albefaction for receiving signal is performed using reference signal.Patent document 1 describe that one kind can be by causing back material
There is material distribution to carry out the ultrasonic detector of suppressed sidelobes rank.
Patent document 1：Japanese patent application discloses No.H6-125894
Patent document 2：Japanese Examined Patent discloses No.H1-24479
Patent document 3：Japanese Examined Patent discloses No.H1-24480
Non-patent literature 1：Hirofumi Taki,Kousuke Taki,Takuya Sakamoto,Makoto
Yamakawa, Tsuyoshi Shiina and Toru Sato:Conf Proc IEEE Eng Med Biol Soc.2010；1:
5298-5301.
As described above, reference signal is used in the Adaptive Signal Processing that FDI methods are applied to.The reference signal is got over and is connect
Reflection configuration acquired in nearly reality, the Adaptive Signal Processing being applied to based on FDI methods realizes more high-space resolution
The effect of rate is bigger.
However, in fact, acoustics wave impulse for being sent in subject, waveform will depend on position of its arrival
(reflection position) and change.Especially, at the position of different depth, the waveform of the acoustics wave impulse of transmission tends to difference.
Accordingly, there exist such situation：Cannot fully produce the Adaptive Signal Processing being applied to based on FDI methods higher to realize
The effect of spatial resolution.
The content of the invention
The present invention is designed in view of the above problems, it is an object of the invention to：Suppress performing what FDI methods were applied to
The influence produced by the spatial resolution deterioration depending on position during Adaptive Signal Processing.
The present invention provides a kind of subject information acquisition device, including：
Detector, including be configured as by acoustic wave be sent to subject, receive subject internal reflection back wave and
It is multiple conversion elements that time series receives signal by reflected wave conversion；With
Processor, is configured as：Use multiple reception signal and the reference signals that are exported from the multiple conversion element
Perform frequency domain interferometric method by application Adaptive Signal Processing, and obtain the acoustic properties of the multiple positions in subject,
Wherein, the detector is configured such that：When the direction for arranging the multiple conversion element be first direction simultaneously
And the direction intersected with first direction is when being second direction, the end in second direction has than pars intermedia in a second direction
Divide the transmission acoustic pressure of low acoustic wave.
The present invention also provides a kind of subject information acquisition device, including：
Detector, including：For the conversion element group for sending, with multiple conversion units that acoustic wave is sent to subject
Part；It is time sequence with the back wave for receiving subject internal reflection and by reflected wave conversion for the conversion element group for receiving
Row receive multiple conversion elements of signal；With
Processor, is configured with receiving signal and base from the multiple of conversion element group output for receiving
Calibration signal performs frequency domain interferometric method by application Adaptive Signal Processing, and obtains the acoustics of the multiple positions in subject
Attribute,
Wherein, the detector is configured such that：When multiple conversion elements of conversion element group of the arrangement for sending
Direction be first direction and when the direction intersected with first direction is second direction, in the conversion element for sending
In group, end in second direction has the transmission acoustic pressure of the acoustic wave lower than center section in a second direction, or is matched somebody with somebody
Be set to so that：In the conversion element group for receiving, the receiving intensity of acoustic wave end ratio in a second direction
Middle part in a second direction is low.
The present invention also provides a kind of control method of subject information acquisition device, the subject information acquisition device tool
There are including sending and receive the detector and processor of multiple conversion elements of acoustic wave, wherein the detector is configured
To cause when the direction of the multiple conversion element of arrangement is the first direction and direction intersected with first direction is second party
Xiang Shi, end in second direction has the transmission acoustic pressure of the acoustic wave lower than center section in second direction,
The control method is comprised the following steps：
The multiple conversion element is operated to be sent to subject with by acoustic wave；
The multiple conversion element is operated to receive the back wave of subject internal reflection, and is the time by reflected wave conversion
Sequential reception signal；And
The processor is operated to use multiple reception signal and the reference signals exported from the multiple conversion element
Perform frequency domain interferometric method by application Adaptive Signal Processing, and obtain the acoustic properties of the multiple positions in subject.
The present invention also provides a kind of control method of subject information acquisition device, the subject information acquisition device tool
There are detector and processor, the detector includes the conversion unit for transmission with the multiple conversion elements for sending acoustic wave
Part group and the conversion element group for reception with the multiple conversion elements for receiving back wave, wherein, the detector quilt
It is configured so that：When arrangement is first direction and with first for the direction of multiple conversion elements of the conversion element group for sending
When the intersecting direction in direction is second direction, in the conversion element group for sending, the end in second direction has
The transmission acoustic pressure of the acoustic wave lower than center section in a second direction, or be configured such that：It is described for receive
In conversion element group, the receiving intensity of acoustic wave end in a second direction is than middle part in a second direction
It is low,
The control method is comprised the following steps：
The operation conversion element group for sending is sent to subject with by acoustic wave；
The operation conversion element group for reception is turned back wave with receiving the back wave of subject internal reflection
It is changed to time series and receives signal；And
Operate the processor with using exported from the conversion element group for receiving it is multiple receive signals and
Reference signal performs frequency domain interferometric method by application Adaptive Signal Processing, and obtains the sound of the multiple positions in subject
Learn attribute.
According to the present invention it is possible to suppress perform FDI methods be applied to Adaptive Signal Processing when depending on position
The influence produced by spatial resolution deterioration put.
From the following description of exemplary embodiment referring to the drawings, further feature of the invention will be clear.
Brief description of the drawings
Fig. 1 is the diagram for explaining reflection configuration；
Fig. 2 is the diagram for explaining the power level when the reflection configuration shown in Fig. 1 is used as to receive signal；
Fig. 3 is the schematic diagram for showing the subject information acquisition device that the application may apply to；
Fig. 4 is the flow chart for explaining the treatment that FDI self-adaptive processings block is performed；
Fig. 5 A to Fig. 5 E are the diagrams explained conversion element and its send acoustic pressure distribution；
Fig. 6 A are the diagrams of the effect for explaining first embodiment；
Fig. 6 B are the diagrams of the effect for explaining first embodiment；
Fig. 7 is the diagram of the effect for explaining first embodiment；
Fig. 8 is the diagram of the effect for explaining first embodiment；
Fig. 9 A and Fig. 9 B are the schematic diagrames of the structure for explaining CMUT；
Figure 10 is the diagram of the configuration of the conversion element for explaining first embodiment；
Figure 11 A to Figure 11 C are the diagrams of the configuration of the conversion element for explaining first embodiment；
Figure 12 is the diagram of the configuration of the conversion element for explaining 3rd embodiment；
Figure 13 is the schematic diagram of the subject information acquisition device for showing fourth embodiment；And
Figure 14 is the diagram of the effect for explaining fourth embodiment.
Specific embodiment
The preferred embodiments of the present invention are explained referring now to accompanying drawing.However, the size of following components, material, shape and relative
Arranging will suitably change depending on the configuration of the device to be applied to of the invention and various conditions, and these embodiments are simultaneously
It is not intended to limit the scope of the present invention to following description.
Inventor focuses on the fact：It is applied to FDI methods are performed by receiving back wave from subject
Adaptive Signal Processing when, the waveform of transmitted acoustic wave depends on the position in the subject and changes.Then, invent
People has found there is such possibility：If sending the waveform in reflection configuration and reference signal produced by the change of waveform
Between exist waveform change, then image will deteriorate.
For example, what is explained is the detector transmission acoustics that conversion element is arranged to a line in one-dimensional square therefrom
The situation of ripple.Fig. 1 is shown transmitted by the linear array from the multiple conversion elements of arrangement in a one-dimensional fashion and in 15mm
Waveform of the acoustics wave impulse that depth is focused in each depth of 11mm, 13mm, 15mm, 17mm and 19mm.Made at this
Term " depth " refers to the distance away from conversion element.In this example, because transmission focus is at 15mm, therefore in 15mm
Depth waveform will substantially with send waveform it is identical.However, as Fig. 1 is obvious, other depth (11mm, 13mm,
17mm, 19mm) place, the waveform from send waveform (waveform i.e. at 15mm) it is different.Especially, it is seen then that in shallow position (distance
The very short position away from conversion element) place waveform and send waveform differ widely.
Fig. 2 is shown as reception signal and (i.e. basic using waveform is sent by using each waveform shown in Fig. 1
The waveform identical waveform of the upper depth with 15mm) self adaptation that FDI methods are applied to is performed as reference signal
Result during signal transacting.Note, the transmission waveform of each depth of Fig. 1 can be counted as substantially with each depth
The reflection configuration at place is identical.In other words, each in the waveform shown in Fig. 1 being used as into reception signal can be counted as substantially
Above with reflection is received from the reflecting surface existed at the position of each depth (11mm, 13mm, 15mm, 17mm, 19mm)
Waveform is identical.
Result according to Fig. 2, can be true in the depth of the reference signal 15mm equal with the waveform for receiving signal
Recognize high-resolution effect.However, at the position of the depth of 11mm, two are shown as the power level of its result
Peak, and because the half width at peak is also wide, it may thus be appreciated that, it is impossible to fully obtain the effect of high spatial resolution.Additionally,
In other depths of 13mm, 17mm and 19mm, the effect of high spatial resolution is than the effect that is obtained at the depth of 15mm
It is lower.Therefore, in order to solve the problem, following examples are unique in that：It is first in the conversion for sending and receive ultrasonic wave
The transmission acoustic pressure (conversion efficiency) of the acoustic wave in part is changed.
Additionally, acoustic wave signified in the present invention is typically ultrasonic wave, and including being referred to as the bullet of sound wave or ultrasonic wave
Property ripple.Subject information acquisition device of the invention includes for acoustic wave being sent to subject, receives the anti-of subject internal reflection
Ejected wave (reflected acoustic ripple), and the acoustic properties at multiple positions in subject are obtained as numerical value or view data
Device.Acquired acoustic properties are the information of the difference of the acoustic impedance of the tissue reflected in subject.Additionally, in the present invention
Signified scan line is the dummy line formed on the preceding line direction of the acoustic wave sent from detector.
<Basic embodiment>
The embodiment of the present invention is explained referring now to accompanying drawing.Used as general rule, identical inscape is given identical label,
And omit its explanation.
(basic configuration of subject information acquisition device)
Fig. 3 is the schematic diagram for showing the subject information acquisition device that the application may apply to.The embodiment it is tested
Body information acquisition device includes detector 001, receiving circuit 005, transtation mission circuit 003, phase containing multiple conversion elements 002
Adjustment/adder block 006 and FDI self-adaptive processings block 007.Subject information acquisition device additionally includes image processing block 010
With system control unit 004.
In this embodiment, by least including receiving circuit 005, transtation mission circuit 003, the and of phase adjustment/adder block 006
FDI self-adaptive processings block 007 constitutes processor.Processor can additionally include system control unit 004 and image procossing
Block 010.
Detector 001 is acoustic wave to be sent into subject 000 and to receive multiple position places in subject anti-
The emittor/receiver of the back wave penetrated, and including acoustic wave is converted into many of electric signal (time series reception signal)
Individual conversion element 002.Used as conversion element, what is used can be the conversion for such as using the piezoelectric element of the phenomenon of piezoelectricity etc
The use electric capacity of element, the conversion element using optical resonance or such as capacitive micromachined ultrasonic transducer (CMUT) etc changes
The conversion element of change.
Transtation mission circuit 003 according to the control signal from system control unit 004 according to focal position or focus direction come
Sending signal (pulse signal) of the generation with time delay and amplitude.Sending signal is imported into multiple conversion elements 002
Each, and acoustic wave is sent to subject as impulse wave from multiple conversion elements 002.It is anti-in subject 000
The acoustic wave (back wave) that firing area face or reflector are reflected is received by multiple conversion elements 002, and is respectively converted into multiple
Receive signal.Receiving circuit 005 is imported into from multiple signals that receive of the output of multiple conversion elements 002.
Receiving circuit 005 is the reception signal that amplification is exported in chronological order from each conversion element and will receive signal
The circuit of multiple data signals (digitized received signal) is converted to, and is made up of amplifier, A/D converter etc..Should
Note, in the following explanation, single based on acoustics wave impulse send from the conversion element output for receiving back wave when
Between sequential reception signal will be counted as one reception signal.Assuming that when the output channel that there is M number, based on acoustics wave impulse
Single send and obtain the reception signal with the corresponding M number of quantity for exporting channel.Additionally, gathering on particular conversion element
Jiao Shi, when acoustics wave impulse sends n times, the reception signal (when i.e. N number of sent for n times will be obtained for the conversion element
Between sequential reception signal).N and M represent positive integer.Additionally, in the present invention, except the simulation exported from conversion element 002 connects
Outside the collection of letters number, undergo to amplify and the signal of digital conversion process also is indicated as receiving signal.From many of the output of receiving circuit 005
Individual data signal is imported into phase adjustment/adder block 006.
Direction that phase adjustment/adder block 006 is sent to according to acoustic wave or position perform to multiple data signals
Delay disposal (phase adjustment treatment), and addition process additionally is performed to it.In other words, phase adjustment/adder block 006
Perform phase adjustment/addition process.The signal (scanning-line signal) for undergoing Such phase adjustment/addition process is imported into FDI
Self-adaptive processing block 007.Scanning-line signal is represented in the direction of advance for undergo the acoustic wave for sending beam forming (in acoustic wave
On beam) signal, and the intensity (strength signal) of the back wave from multiple positions present on single scanning-line signal exists
It is arranged in chronological order in the scan line.On standard ultrasound device shown B-mode image be with multiple scan lines
The corresponding amount of quantity arrange the result of the envelope of scanning-line signal.
FDI self-adaptive processings block 007 by using the multiple scanning-line signals exported from phase adjustment/adder block 006 with
And process be applied to Adaptive Signal Processing (hereinafter from the reference signal of the output of system control unit 004 performing FDI
It is referred to as " FDI self-adaptive processings ").
Adaptive Signal Processing is corresponding with adaptive beamforming.In other words, Adaptive Signal Processing represents such
Treatment：Adaptively change processing parameter (such as phase and weight) according to signal is received, selectively extract and focused on from target
The reception signal of the expectancy wave that direction or focal position are reached, and suppress the reception signal of other undesired ripples.Especially,
It in the sensitivity relevant with focus direction or focal position is fixed to be as the Capon methods of a class Adaptive Signal Processing
Method of multiple input signals to cause output (power level) to minimize is processed under state.The method is also referred to as power direction
Property constrained minimization (DCMP) or minimum deflection method.This Adaptive Signal Processing produces the effect for being capable of room for improvement resolution ratio
Really.In this embodiment, the example as Adaptive Signal Processing using Capon methods is explained in detail.It is also possible, however, to use
Other Adaptive Signal Processings (MUSIC methods or ESPRIT methods).
Frequency domain interferometric method (FDI methods) is by changing for each frequency decomposition reception signal and according to focal position
The phase of the signal after Variational Solution Used is come the method for estimating the receiving power in focal position.Note, based on from special datum position
The distance of focal position and the product of wave number corresponding with frequency is put to predefine the change of phase.
In other words, Adaptive Signal Processing and FDI Combination of Methods are produced and is calculated by using according to reception signal
Phase shift and weight amount rather than the phase shift by using the reception signal on being decomposed into each frequency component and weight
Scheduled volume calculates the power level in focal position.Explained performed by FDI self-adaptive processings block 007 later with reference to Fig. 4
Treatment details.In this embodiment, the group in the power level and reflection subject that are calculated based on FDI self-adaptive processings
The acoustic properties correspondence of the difference of the acoustic impedance knitted.Additionally, the image processing block 010 in rear class exports strong according to multiple power
The power level spent and configure is distributed as view data.
Image processing block 010 performs various types of image procossings (such as to being configured according to multiple power levels as needed
Input power intensity distribution the enhancing of smooth and edge), and brightness data (view data) output is shown into dress to image
Set to 0 11.Image display device 011 shows be input into brightness data.
Note, (such as CPU, GPU (GPU) or scene can for example by processing unit for FDI self-adaptive processings block 007
Programming gate array (FPGA) chip etc.) constitute.System control unit 004 and image processing block 010 similarly by processing unit (such as
CPU, GPU or FPGA) constitute.Image display device 011 is aobvious by liquid crystal display (LCD), cathode-ray tube (CRT) or organic EL
Show that device etc. is constituted.Note, image display device 011 is provided separately from subject information acquisition device of the invention.
(flow of FDI self-adaptive processings)
The treatment performed by FDI self-adaptive processings block 007 is explained referring now to Fig. 4.Fig. 4 is to explain FDI self-adaptive processings
The flow chart of each step.The scanning-line signal that FDI self-adaptive processings block 007 is received from the output of phase adjustment/adder block 006 is made
It is input signal (S200).FDI self-adaptive processings block 007 then extracts the process time with a treatment from scanning-line signal
Corresponding strength signal (strength signal i.e. corresponding with process range) (S201).Here, as FDI self-adaptive processing blocks
Treatment performed by 007, in addition to the multiple strength signals from a scan line extract signal corresponding with process range,
Can also carry out the treatment of the weighting of such as each strength signal etc.
Then, the signal for extracting undergoes Fourier transform, and be divided into each frequency component (Xs1, Xs2,
Xs3、……、XsN)(S202).Meanwhile, it is imported into FDI self-adaptive processings from the reference signal of the output of system control unit 004
Block 007 (S203).
Then, FDI self-adaptive processings block 007 performs the Fourier transform of reference signal, and reference signal is divided into
Each frequency component (Xr1, Xr2, Xr3 ... XrN) (S204).
Then, FDI self-adaptive processings block 007 performs the whitening processing (S205) as shown in formula (1).
[mathematical expression 1]
Here, Xwk (k=1,2 ..., N) be each frequency after whitening processing component, η is for stabilization
Track is measured, and * represents complex conjugate.
Next, the vector X (formula (2)) constituted from each frequency component for undergoing whitening processing is used for computing formula
(3) the correlation matrix R (S206) shown in.
X=[XW1,XW2,...,XWN]T...(2)
R=XXT*...(3)
Note, T represents transposition.Here, correlation matrix R will be the matrix with size N × N.
Then, part matrix, and the frequency averaging technology that application is averaged to frequency are extracted from correlation matrix R
(S207)。
[mathematical expression 2]
Rmij=XW(i+m-1)XW(j+m-1)*...(5)
R ' is frequency averaging correlation matrix, and Rm is the part matrix as the correlation matrix R of member with Rmij.Thus root
Frequency averaging correlation matrix R ' (S208) is calculated according to formula (4) and formula (5).
Then, constraint vector C is input to FDI self-adaptive processings block 007 (S209).Constraint vector C is according to treatment model
Position r in enclosing and the vector that changes, and defined by below equation (6).
C=[exp (jk1r),exp(jk2r),...,exp(jk(N-M+1)r)]...(6)
Frequency averaging correlation matrix R ' and constraint vector C is used to calculate the power in the process range as shown in formula (7)
Intensity distribution P (r) (S210).
[mathematical expression 3]
η ' E are added to stablize the calculating of inverse matrix, η is according to constant or Rxx,1The value for being worth and changing, E is unit square
Battle array.
Then, when there is untreated signal among input signal, routine returns to the extraction (S201) of signal, and
And treatment continues (S211).When all signals are had been processed by, the treatment terminates.
As described above, FDI self-adaptive processings block 007 is by using the multiple scanning exported from phase adjustment/adder block 006
Line signal and the reference signal from the output of system control unit 004 perform what FDI methods were applied to as input signal
Adaptive Signal Processing.As a result power output intensity distribution.
Now explain conversion element 002.Fig. 5 A are the diagrams for schematically showing conversion element of the invention.In orientation
Multiple conversion elements are arranged in (horizontal direction in diagram).Fig. 5 B to Fig. 5 D are shown in the orientation with a conversion element
Transmission acoustic pressure on intersecting direction (vertical direction in diagram).The three width diagrams of Fig. 5 B to Fig. 5 D are illustrated respectively in does not sympathize with
The transmission acoustic pressure distribution in the X-X ' sections of Fig. 5 A under condition.Note, in the following explanation, the orientation of conversion element sometimes by
Referred to as " first direction ", the direction intersected with the orientation of conversion element is sometimes referred to as " second direction ".
The transmission acoustic pressure distribution 501 of Fig. 5 B has the direction intersected in the orientation (first direction) with conversion element
Until the uniform transmission sound pressure of end in (second direction).The transmission acoustic pressure distribution 502 of Fig. 5 C is the hair of wherein acoustic wave
Send the transmission sound pressure that acoustic pressure end in a second direction is lower than center section in a second direction.For Fig. 5 D
Transmission acoustic pressure distribution 503, compared with the situation of Fig. 5 C, the transmission acoustic pressure of end in a second direction even ratio is in centre
Transmission acoustic pressure at part is low more.Note, as shown in fig. 5e because in a second direction perform acoustic wave transmission wave beam into
Shape, so providing acoustic lens on the tested side (side that acoustic wave is sent to) of conversion element 002 in detector
504。
Fig. 6 A show to send acoustic wave when the transmission acoustic pressure distribution by using the three types shown in Fig. 5 B to Fig. 5 D
With the waveform when the depth of 15mm is focused at 11mm.In the diagram, chain-dotted line show when with the width with 8mm
Conversion element the intersecting direction (second direction) of orientation (first direction) on uniformly sending intensity distribution transmission sound
Waveform (corresponding with acoustic pressure distribution 501 is sent) when learning ripple.In the diagram, dotted line is shown when the end in reduction second direction
0.5mm transmission intensity distribution when waveform (acoustic pressure distribution is 502 corresponding with sending).In the diagram, solid line shows to work as and subtracts
Waveform (corresponding with acoustic pressure distribution 503 is sent) during the transmission intensity distribution of the 1mm of the end in few second direction.Additionally, figure
6B shows the wavelength when the depth focusing acoustic ripple in 15mm.
It is obvious from these results, by causing that the end in second direction has the transmission acoustic pressure lower than center section,
Send the wavelength that waveform approaches the depth of its focusing.In other words, the change of the waveform caused by depth can be suppressed.
Fig. 7 shows that the reference signal changed by using the waveform considered in the depth of 15mm is performed at FDI self adaptations
The result of reason.In the diagram, solid line shows the treatment knot when the transmission acoustic pressure of the 1mm of end of element of the invention is reduced
Really.In the diagram, dotted line shows result when sending sound pressure uniform when conversion element.As shown by the solid line, by drop
The transmission acoustic pressure of the end of low element, can suppress to change in the waveform of each depth, and it is seen that being stably based on
The effect (especially in the depth of 11mm) of the improved spatial resolution of FDI self-adaptive processings.
Fig. 8 shows that the reference signal changed by using the waveform considered in the depth of 18mm is performed at FDI self adaptations
The result of reason.In the diagram, solid line shows the treatment knot when the transmission acoustic pressure of the 1mm of end of element of the invention is reduced
Really.In the diagram, dotted line shows result when sending sound pressure uniform when conversion element.As shown by the solid line, by drop
The transmission acoustic pressure of the end of low element, can suppress to change in the waveform of each depth, and it is seen that being stably based on
The effect of the improved spatial resolution of FDI self-adaptive processings.
As described above, by with the second direction that intersects of first direction of arrangement conversion element by the transmission sound of end
Pressure is reduced to, the effect of the waveform change of can be inhibited each depth lower than the transmission acoustic pressure of center section, and base
In FDI self-adaptive processing room for improvement resolution ratio.
The embodiment of subject information acquisition device is explained referring now to accompanying drawing.Note, used as total rule, identical is constituted
Element is given identical label, and omits its explanation.
<First embodiment>
The subject information acquisition device of the embodiment is configured using with the device identical shown in Fig. 1.In the embodiment
In, the shape of conversion element 002 is described in further detail, because remaining handling process is identical with the treatment that reference picture 4 is explained, because
This omits its explanation.
In this embodiment, it is used as conversion element using the CMUT of capacitance variations.Fig. 9 is schematically shown in CMUT
One diagram of unit, wherein, Fig. 9 A are plans, and Fig. 9 B are sectional views.In a unit, film is formed on gap 901
Structure 902, additionally places electrode 903 in membrane structure 902.Note, because Fig. 9 shows a unit, so omitting connection
The explanation of the wiring of the electrode 903 of multiple units.In fig .9, substrate 904 (such as silicon substrate) be used as electrode 903 to electrode.Note
Meaning, it would however also be possible to employ with the configuration that substrate 904 is provided separately from bottom electrode.
The unit of CMUT has a structure in which：The chamber (gap 901) as gap between including riding over one another and carry
The vibrating membrane of the electrode (in the case of Fig. 9, electrode 903) in a pair of electrodes of confession is vibrated supported.Specifically,
The vibrating membrane of Fig. 9 includes electrode 903 and membrane structure 902.It is input to as lower electricity by using voltage waveform signal (alternating voltage)
The substrate 904 of pole or the electrode 903 as Top electrode, membrane structure 902 are attributed to electrostatic attraction and are attracted towards gap 901.
Furthermore, it is possible to be based on the recovery of this gravitation to generate acoustic wave.
Figure 10 is the schematic diagram of the conversion element 002 (element) for showing CMUT.It is disposed with an element
Multiple units similar to the unit shown in Fig. 9.Additionally, being formed shown in Fig. 5 by the multiple element shown in layout drawing 10
Conversion element array.CMUT is input into and output signal in each unit of the element.In other words, when a unit is counted as
During one electric capacity, the electric capacity of the multiple units in element is concurrently electrically connected.Additionally, what each element was electrically isolated.
In Fig. 10, horizontal direction is the orientation (first direction) of conversion element 002.In this embodiment, change
On the direction (second direction) that quantity (the there is density) court of the CMUT units of per unit area intersects with first direction on element
End reduce.It is possible thereby to so that the end in second direction has the transmission sound of lower acoustic wave compared with center section
Pressure.Note, can by same voltage drive waveforms are input to each CMUT units arranged on same conversion element 002 come
Obtain effect of the invention.
As the result by using the transmission acoustic wave of conversion element 002 for configuring as described above, can suppress every
The send wave deformation of individual depth, and thus more stably obtain the effect of FDI self-adaptive processings.
Note, in Fig. 10, effect of the invention is obtained by changing the presence density of CMUT units.However, unit
Configuration not limited to this.As shown in Figure 11 A, the configuration that can be reduced towards end using electrode size.Additionally, as shown in Figure 11 B,
The size of membrane structure can also be changed.Additionally, as shown in Figure 11 C, wherein the quantity for not forming the unit of electrode can be in film knot
Increase towards end in structure.Additionally, although it is not shown, but the thickness in gap can increase towards end.Can by it is any this
A little methods obtain effect of the invention.
<Second embodiment>
The subject information acquisition device of the embodiment is configured using with the device identical shown in Fig. 1.In the embodiment
In, explain that piezoelectric element is used as conversion element 002 and is arranged to the situation of a line, due to remaining handling process and reference picture
4 treatment explained are identical, therefore omit its explanation.
In this embodiment, piezoelectric element (such as PZT) is used as conversion element.Especially, such as (the Japan Patent of patent document 1
The open No.H6-125894 of application) described in as, thus it is possible to vary the acoustic impedance of backing material, to cause in second party
To the transmission acoustic pressure of the end on (direction intersected with the first direction of arrangement piezoelectric element) by than in middle part
Send acoustic pressure lower.In other words, in a second direction so that the back material on behind the center section of piezoelectric element
The acoustic impedance of material than the backing material on behind end acoustic impedance closer to piezoelectric element acoustic impedance.
Additionally, such as patent document 2 (Japanese Examined Patent discloses No.H1-24479) and (Japanese Examined Patent of patent document 3
Open No.H1-24480) described in as, piezoelectric element itself can be processed, to cause end in a second direction
Transmission acoustic pressure at portion will be lower than transmission acoustic pressure in middle part.
Correspondingly, acoustic wave is sent from detector by using the piezoelectric element configured according to the embodiment, can be suppressed
The send wave deformation of each depth, and thus more stably obtain the effect of FDI self-adaptive processings.
<3rd embodiment>
The subject information acquisition device of the embodiment is configured using with the device identical shown in Fig. 1.The implementation is illustrated
Release the situation that multiple conversion elements 002 are two-dimensionally arranged in the way of 1.5D arrays, 1.75D arrays or 2D arrays.Because remaining
Handling process is identical with the treatment that reference picture 4 is explained, so omitting its explanation.
In this embodiment, it is also possible to use the conversion element of CMUT, piezoelectric element or any other species.Additionally, very
Extremely in the example of arrangement conversion element in two dimensions, can be by design such as first embodiment and second embodiment
The configuration of CMUT, piezoelectric element or backing material is reduced in second direction (with the orientation as conversion element first
The intersecting direction in direction) on end acoustic pressure.However, in this embodiment, and must not always design the configuration of CMUT
Or the configuration of designing piezoelectric element or backing material, the acoustic pressure of end in a second direction could be reduced.In other words, lead to
Cross the sending signal for being designed for sending acoustic wave, it is also possible to obtained with the conversion element in a second direction with homogeneous texture
Obtain effect of the invention.In the following explanation, specifically as shown in figure 12, the feelings of the sending signal in design 1.5D arrays are explained
Condition.Here, in the case of using 1.5D arrays, the orientation of conversion shows the direction for performing electron scanning (in Figure 12
Horizontal direction).In other words, this be the combination in switch transition element group successively with perform acoustic wave transmission beam forming simultaneously
And electronic scan direction (the i.e. linear scan side in the case of electron scanning is performed from one end of conversion element group to the other end
To).
In this embodiment so as to be input to the end in the second direction (vertical direction in Figure 12) in detector
Amplitude (intensity) ratio of the sending signal of the conversion element at place is to be input in the sending signal of the conversion element of middle part
Amplitude (intensity) it is small.It is possible thereby to so that the conversion element of end in a second direction has than in middle part
The smaller transmission acoustic pressure of conversion element.Additionally, in this embodiment, to be input to the multiple conversion arranged in a second direction
Time delay is provided between each sending signal of element 002.In other words, by will additionally be supplied to the time difference to electricity
The sending signal of the conversion element 002 on the intersecting direction in sub- scanning direction, acoustic wave can also be focused in a second direction, and
Lens need not be provided.Especially, to be input to middle part conversion element sending signal should relative to be input to
Intersect the sending signal of the conversion element of the end on direction and postpone.Undoubtedly, in this embodiment, it is also possible to by turning
Change in the front face side of element and lens and in a second direction focusing acoustic ripple are provided.
Therefore, the detector of the embodiment can also be configured such that transmission acoustic pressure by end in a second direction
It is lower than center section in a second direction.Therefore, it can suppress the send wave deformation of each depth, and it is thus more stable
Ground obtains the effect of FDI self-adaptive processings.Additionally, in the case of 2D arrays, existing and using all conversion elements of 2D arrays
To perform the situation of subarea-scanning.In the case of with this 2D arrays, the conversion except reducing end in a second direction
Outside the transmission acoustic pressure of element, the transmission acoustic pressure of the conversion element of end in a first direction can also be reduced.In other words
Say, not only reduce the transmission acoustic pressure of the conversion element of end in one direction, the conversion at the periphery of 2D arrays
The transmission acoustic pressure of element also should be lower than the conversion element in middle part.
<Fourth embodiment>
Figure 13 is the diagram of the configuration for schematically showing the subject information acquisition device used in the embodiment.With it is preceding
It is to provide reference signal record block 009 to state embodiment difference.Reference signal record block 009 be for subject in
Position accordingly stores the memory of multiple reference signals of different wave.Specifically, the storage of reference signal record block 009 difference
Accordingly there are multiple reference signals of different wave with the position on the depth direction in subject, or respectively according to acoustic wave
Sending direction and there are multiple reference signals of different wave.Additionally, reference signal record block 009 can also be stored according to depth
Degree and sending direction and multiple reference signals for changing.When from 009 output reference signal of reference signal record block, without output
The all reference signals stored in reference signal record block 009.
Operation and the system control unit of the reference signal record blocks 009 different from previous embodiment will be explained in detail in
004 operation.Note, in addition to the processor of previous embodiment, the processor in the embodiment can also be believed including benchmark
Number record block 009.
While FDI self-adaptive processings block 007 just performs FDI self-adaptive processings, the command reference of system control unit 004
Signal record block 009 exports two or more respectively different reference signals.In other words, FDI self-adaptive processings block 007 leads to
The position switching reference signal crossed in subject performs FDI self-adaptive processings at least one times.Especially, according to depth
(i.e. the reception time of back wave) or the sender of acoustic wave always switch reference signal at least one times.
Especially, under according to depth come the pattern for switching reference signal, FDI is just being performed using single scanning-line signal
While self-adaptive processing, switching reference signal is at least one times.In other words, by single scanning-line signal
The strength signal of the strength signal at one position and (different from the first position) second place on same scanning-line signal
FDI self-adaptive processings are performed using different reference signals.However, without switching benchmark letter every time for each position
Number.When single scanning-line signal is processed, reference signal should be switched according to position at least one times；For example, can be whenever in quilt
FDI self-adaptive processings are performed using the first reference signal when in the shallow scope in a corpse or other object for laboratory examination and chemical testing, can be made whenever in deep scope
FDI self-adaptive processings are performed with the second reference signal.Additionally, reference signal need not be prepared for each position.Can be directed to
Each scope in predetermined domain prepares reference signal.The multiple power levels for obtaining as described above are output to image procossing
Block 010.
When this treatment is performed, still can be based on so that (intersecting with the orientation of conversion element in second direction
Direction) on end acoustic wave transmission acoustic pressure than suppressing the transmission of each depth in the low configuration of middle part
Waveform changes.Additionally, in this embodiment, by using reference signal corresponding with the change for sending waveform, acquisition can be more
Stably perform the effect of FDI self-adaptive processings.
Figure 14 shows to realize the result of the treatment according to the embodiment.
Solid line in diagram is shown in the case of the conversion element of the transmission intensity distribution using the 1mm for reducing end
Result.Using in the depth and scope DC of the 15mm in depth, the scope DB for considering the 12mm in scope DA
The reference signal of the waveform of the depth of 18mm performs FDI self-adaptive processings.In diagram, dotted line is shown when conversion element
Result when sending sound pressure uniform and FDI self-adaptive processings are performed using the waveform of the depth in 18mm.To
When the two is compared, as shown by the solid line, by using the reference signal according to depth rather than the end for only reducing element
Send acoustic pressure, it is seen that obtain being capable of the effect of further room for improvement resolution ratio.
<5th embodiment>
In in the aforementioned embodiment each, as can send and receive the transmitter and receiver of ultrasonic wave
Conversion element is used as the conversion element 002 of detector 001.However, the present invention can also use separate conversion element as with
Conversion element group in the conversion element group for sending and for receiving.In other words, it is possible to use the conversion unit for sending
Part is connected to transtation mission circuit 003 and the configuration that the different conversion elements for receiving is connected to receiving circuit 005 is come into real
The existing present invention.In the previous case, can be by reducing the end in the second direction in for the conversion element for sending
Solved in the fact that the acoustic pressure of output is to suppress the send wave deformation for each depth such as in the aforementioned embodiment each
As releasing.Further, it is also possible to use the receiving intensity of the acoustic pressure for reducing the end in for the conversion element for receiving
Configure to obtain effect of the invention.This is based on sending waveform and receives the correlation between waveform.
<Sixth embodiment>
Meanwhile, using the imaging method of such as Doppler and elastic graph (elastography) etc., believed by using receiving
Number phase or correlation come calculating speed and hardness.In using this treatment of Such phase and correlation, it is preferable that connect
The waveform of the collection of letters number has smaller strain, and for example, the waveform for sending focal position is preferable.Obtained in the present invention
Reception waveform hardly change in the depth direction, and due to non-focal position waveform close to focal position waveform,
So the imaging method of such as Doppler and elastic graph etc can be performed by precision higher.Correspondingly, the present invention not
It is limited to FDI self-adaptive processings, but the imaging method using sending signal and the focusing for receiving signal can also be applied to.
<7th embodiment>
In addition it is also possible to realize the present invention by performing following treatment, in other words, previous embodiment can be realized
In the software (program) of the function of each be supplied to system or device and the system via network or various storage mediums
Or computer (the CPU, MPU etc.) reading and the treatment of configuration processor of device.The present invention can also be counted as wherein subject
Each block of information acquisition device performs the subject information acquisition method for the treatment of, or subject information acquisition device controlling party
Method.
By reading and the program that is recorded on memory devices can also be performed to perform the function of above-described embodiment
The computer (or equipment of such as CPU or MPU etc) and its step of system or device are by for example, by reading and performing
The program recorded on memory devices is come in the method that the computer of the system or device that perform the function of above-described embodiment is performed
Realize each aspect of the present invention.Therefore, for example via network or from the various types of recording medium (examples for serving as memory devices
Such as non-volatile computer-readable medium) program is supplied to computer.Therefore, computer (including such as CPU or MPU etc
Equipment), method, program (including program code and program product) and the non-volatile computer that is recorded to program can
Read medium to be embraced within the scope of the present invention.
Although describing the present invention with reference to exemplary embodiment, it should be appreciated that the invention is not restricted to disclosed example
Property embodiment.Scope of the following claims will be endowed broadest explanation, so as to include all such modifications and
Equivalent 26S Proteasome Structure and Function.
Claims (15)
1. a kind of subject information acquisition device, including：
Detector, including be configured as acoustic wave being sent into subject, the back wave of reception subject internal reflection and being reflected
Ripple is converted to multiple conversion elements that time series receives signal；With
Processor, is configured as：Passed through using the multiple reception signals and reference signal that are exported from the multiple conversion element
Perform frequency domain interferometric method using Adaptive Signal Processing, and obtain the acoustic properties of the multiple positions in subject,
Wherein, the detector is configured such that：When the direction for arranging the multiple conversion element be first direction and with
When the intersecting direction of first direction is second direction, the end in second direction has lower than center section in a second direction
Acoustic wave transmission acoustic pressure.
2. subject information acquisition device as claimed in claim 1,
Wherein, determined based on the waveform of the acoustic wave of the desired depth that subject is sent to from the multiple conversion element described
Reference signal.
3. subject information acquisition device as claimed in claim 2,
Wherein, the desired depth is the transmission focus when the multiple conversion element performs electron scanning in a first direction
Depth.
4. subject information acquisition device as claimed in claim 2 or claim 3,
Wherein, acoustic wave is sent to the depth of subject to switch the base by the processor according to the multiple conversion element
Calibration signal.
5. subject information acquisition device as claimed in claim 2,
Wherein, acoustic wave is sent to the direction of subject to switch the base by the processor according to the multiple conversion element
Calibration signal.
6. subject information acquisition device as claimed in claim 1,
Wherein the multiple conversion element is arranged to a line, and
Wherein described detector includes being provided at the acoustic lens on the side of the transmission acoustic wave of the multiple conversion element.
7. subject information acquisition device as claimed in claim 1,
Wherein, each in the multiple conversion element is made up of the CMUT including multiple units.
8. subject information acquisition device as claimed in claim 7,
Wherein, for the CMUT, the density of unit end in a second direction is than center section in a second direction
It is low.
9. subject information acquisition device as claimed in claim 7,
Wherein, for the CMUT, the electrode of unit end in a second direction is smaller than the center section in second direction.
10. subject information acquisition device as claimed in claim 1,
Wherein, each in the multiple conversion element is made up of piezoelectric element.
11. subject information acquisition devices as claimed in claim 1,
Wherein, in the detector, multiple conversion elements are also arranged in a second direction, and
Wherein, the conversion element of end in a second direction is configured with than middle part in a second direction
The low acoustic wave of conversion element transmission acoustic pressure.
12. subject information acquisition devices as claimed in claim 1,
Wherein, in the detector, multiple conversion elements are also arranged in a second direction, and
Wherein, the transmission of the acoustic wave of the conversion element from end in a second direction is by relative to next comfortable second party
The transmission of the acoustic wave of the conversion element of upward middle part postpones.
A kind of 13. subject information acquisition devices, including：
Detector, including：For the conversion element group for sending, with multiple conversion elements that acoustic wave is sent to subject；
For the conversion element group for receiving, with the back wave for receiving subject internal reflection and by reflected wave conversion for time series connects
Multiple conversion elements of the collection of letters number；And
Processor, is configured as：Signal and benchmark are received using from the multiple exported for the conversion element group for receiving
Signal performs frequency domain interferometric method by application Adaptive Signal Processing, and obtains the acoustics category of the multiple positions in subject
Property,
Wherein, the detector is configured such that：When the multiple conversion of the arrangement conversion element group for sending
The direction of element is first direction and when the direction intersected with first direction is second direction, in the conversion for sending
In element group, end in second direction has the transmission acoustic pressure of the acoustic wave lower than center section in a second direction, or
It is configured such that：In the conversion element group for receiving, the receiving intensity of acoustic wave end in a second direction
Place is lower than middle part in a second direction.
A kind of 14. control methods of subject information acquisition device, the subject information acquisition device has to be included sending simultaneously
And the detector and processor of multiple conversion elements of acoustic wave are received, wherein the detector is configured such that to work as arranging
The direction of the multiple conversion element is first direction and when the direction intersected with first direction is second direction, second direction
On end there is the transmission acoustic pressure of the acoustic wave lower than center section in second direction,
The control method is comprised the following steps：
The multiple conversion element is operated to be sent to subject with by acoustic wave；
The multiple conversion element is operated to receive the back wave of subject internal reflection, and is the time by the reflected wave conversion
Sequential reception signal；And
The processor is operated to pass through with using the multiple reception signals and reference signal that are exported from the multiple conversion element
Perform frequency domain interferometric method using Adaptive Signal Processing, and obtain the acoustic properties of the multiple positions in subject.
A kind of 15. control methods of subject information acquisition device, the subject information acquisition device have detector and
Processor, the detector includes the conversion element group and tool for transmission with the multiple conversion elements for sending acoustic wave
There is the conversion element group for reception of the multiple conversion elements for receiving back wave, wherein, the detector is configured such that：
When the direction of the arrangement the multiple conversion element for the conversion element group for sending is first direction and and first party
When to intersecting direction being second direction, in the conversion element group for sending, the end in second direction have than
The transmission acoustic pressure of the low acoustic wave in center section in a second direction, or be configured such that：Described for turning for receiving
Change in element group, the receiving intensity of acoustic wave end in a second direction is lower than middle part in a second direction,
The control method is comprised the following steps：
The operation conversion element group for sending is sent to subject with by acoustic wave；
The operation conversion element group for reception is turned the back wave with receiving the back wave of subject internal reflection
It is changed to time series and receives signal；And
The processor is operated to use multiple reception signal and the benchmark exported from the conversion element group for receiving
Signal performs frequency domain interferometric method by application Adaptive Signal Processing, and obtains the acoustics category of the multiple positions in subject
Property.
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|---|---|---|---|
| JP2013092668A JP6238556B2 (en) | 2013-04-25 | 2013-04-25 | Subject information acquisition apparatus, control method therefor, and probe |
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| CN201410169720.0A CN104116521B (en) | 2013-04-25 | 2014-04-25 | Object information acquiring apparatus and control method thereof |
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| JP6238556B2 (en) | 2017-11-29 |
| CN106824731B (en) | 2019-12-27 |
| CN104116521A (en) | 2014-10-29 |
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| EP2804019A2 (en) | 2014-11-19 |
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